make € on input line optional

diff --git a/mksh/eurocalc b/mksh/eurocalc
index 178894f..87ce6e4 100755 (executable)
--- a/mksh/eurocalc
+++ b/mksh/eurocalc
@@ -110,7 +110,7 @@ while IFS= read -r line; do
                print -r -- "$h$r"
                continue
        fi
-       if [[ $r != +([0-9])[,.]@([0-9][0-9]|--)' €' ]]; then
+       if [[ $r != +([0-9])[,.]@([0-9][0-9]|--)?(' €') ]]; then
                print -ru2 -- "E: bad input on line #$ln"
                print -ru2 -- "N: ${r@Q}"
                exit 1